Rear sight mechanism



www .33258 OR 198349637 5R um MIV Dec. 1,-1931. -J. D. PEDERSEN 1,834,637

- REAR SIGHT MEcHANsM Filed Aug. 15, 1929 2 Sheets-Sheet l Immun-v' IIIINIHIIIL,

Dee. 1,'19331. L D, PEDERSEN 1,834,637

REAR SIGHT MECHANISM Filed Aug. l5, 1929 2 Sheets-Sheet 2 @a if,

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Patented Dec. 1, 1931 UNITED STATES JOHN D. PEDERSEN, F JACKSON, WYOMING REAR SIGHT ME GHANISM Application led August 13, 1929.

This invention relates to a rear sight mechanism for small arms, and has for its object the provision of a simple, rugged construction allowing for easy and accurate adjusti ment of the sight for both elevation and windage. More particularly the present invention is an improvement over the sight mechanism shown in my copending application Serial No. 382,393, filed July 31,1929 which is a division of my application Serial No. 197,718,

filed J une 9, 1927, now Patent 1,737,974,

granted Dec. 3, 1929.

. Referring to the drawings:

Fig. 1 is a rear view of the sight mechanism;

Fig. 2 is a side View thereof;

Fig. 3 is a top view thereof and a portion of the gun on which it is mounted;

Fig. 4 is a bottom View thereof;

Fig. 5 is a View in vertical section of the sight mechanism along line 5-5 of Fig. 3 and also showing in section a portion of a gun and the mounting for the sight mechanism;

Fig. 6 is a View in vertical section of the sight mechanism through line 6-6 of Fig. 3;

Fig. 7 is a view in horizontal section of the sight mechanism through line 7-7 of Fig. 2;

Fig. 8 is a group detail of the elevation nut 39 spindle, spring and stem;

Fig. 9 is a detached view of the windage slide Fig. 10 is a detached view of the windage slide detent plunger;

Fig. 11 is a right end view of the windage slide; and

Fig. 12 is a similar view of the windagel slide plunger.

Referring to the drawings in detail and more particularly to Fig. 5, l is a portion of the gun stock onwhich the sight is to be mounted, and 2 is the receiver or metallic portion of said gun frame. At the rear of the gun receiver, upstanding portions 4 and 5 (see Fig. 3) are preferably provided to furnish a support and vertical slideway for the sight mechanism.

The sight mechanism comprises an elevation slide member 6 formed with U-shaped side portions adapted to slidably work in Serial No. 385,609.

guiding grooves 7 formed on the upstanding receiver portions 4 and 5 of the gun. The rear of said slide 6 is formed with spaced upper and lower ledge portions 8 and 9, respectively, which are pierced with aligned openings for receiving therein a vertical hollow spindle. 10. Mounted to rotate on the hollow spindle 10 as a bearing and carried between the upper and lower ledges 8 and 9 of the elevation slide, is the elevation nut 11. This nut is formed with spiral threads 12 at its 'periphery adapted to engage with a cylindrical rack post 13, which latter is fastened in the receiver 2 preferably by having its lower end 14 tapped into said receiver, as shown in Fig. 5. The .upper end of said rack post 13 has a screw-driver head 15 by which it may be turned for adjustments, and a locking stud 16 is tapped into the receiver for engaging said post 13, as shown in Fig. 3. It will be understood that the vertical adjustment of rack post 13 is for varying the zero position of the elevation slide and need be very slight. A partial turn of the rack post is suiiicient for this purpose. 75 The elevation nut 11 with its spindle 10 is retained in position on the elevation slide by means of a locking stem 17 and a spring 18, shown in group in Fig. 8. When these parts are assembled, a pair of key lugs 19 on said stem 17 straddle a portion of the lower ledge 9 (as shown in Fig. 5) and the spring 18 imparts an upward thrust on the spindle 10. The lower end of spindle 10 has a detent 20 adapted to engage positioning notches 21 formed on the underside of said elevation nut 11. A stop pin 22 is provided on the underside of the elevation nut 11 to engage shoulder .20 of the detent 20 and limit the nut to something less than a complete rotation. The detent 20 works through a slot 9 of said lower ledge 9, as shown in Fig. 4.

When the sight mechanism is mounted on the gun, the lower end of the key stem 17 eX- tends downwardly through a hollow nut of the stock mounting and impinges against a plunger 23 carried in said stock and thrust upwardly by a spring 24 whereby an upward pressure is imparted on said key stem and parts connected therewith for taking up play 100 or slack in the elevation mechanism of the sight. This vertical adjusting mechanism is covered broadly by my application 382,393, above referred to.

Mounted for a transverse sliding movement in the elevation slide 6 is a windage slide 25 carrying a sighting point 26 ntermediate the ends thereof. Rounded ends 27 and 28 of said windage slide are housed for bearing movement within the elevation slide 6, as shown in Fig. 6, and each of said ends 27 and 28 is preferably marked with lines 29 and 30 which serve to indicate the amount of adjustment of said windage slide either to the right or to the left. When adjusted to the left, the lines 29 are successively eX- posed; and when adjusted to the right, lines 30 are successively exposed from within the elevation slide 6.

Beneath and parallel to the windage slide 25 is mounted the windage screw 31 which is screw tapped at its inner end 32 into the elevation slide 6 and is provided at its outer end with a faceted knob 33. The windage screw 31 and windage slide 25 are adapted to travel together transversely and are preferably connected by means of a key portion 34 of the windage slide fitted in a grooved portion 35 of said windage scr-ew. A ratchet holding device is provided between the windage screw and windage slide in order to releasably retain said windage screw in its various adjustments. This ratchet holding device preferably comprises a plunger 36 carried in the windage slide, backed up by a spring 37 and having at its outer end a detent 38 and thumb-pressed portion 39. The inner face of the knob 33 is provided with notches for engagement by the detent 38 of said plunger.

As shown in Fig. 7, the windage screw 31 is at right angles to the spindle 10 and saidv windage screw is preferably formed with a reduced intermediate portion 40 in tangential relation to said stem 10. Notches 41 and 42 are cut in the stem 10 to provide stopping` shoulders adapted to engage the shoulders 43 and 44 at each end of said reduced portion 40 of the windage screw and thereby limit the transverse adjustable movement of said windage screw to the right and to the left. It will also be observed that in order to remove the windage slide and screw for disassembly, the spindle 10 must first be removed. The reduction in size of the windage screw at its intermediate portion 40 permits more easily the giving of a slight spring tension to said windage screw which would tend to bend it out of its straight aXial line. Such a spring tension in the windage screw is desirable in order to make its tapped end work in its engaged threads with an absence of slack or play.

The facet surfaces on the periphery of the knob 33 are suitably marked with numerals to indicate the amount of turning and adjustment of said windage screw. Graduation lines for indicating elevation are also marked on the bevelled upper surface 45 of the elevation nut 11.

In the use of the present sight mechanism, the adjustment for elevation is obtained by turning the nut 11 which carries the elevation slide 6 up or down on the rack post 13. Adj ustment for windage is obtained by turning knob 33 which carries the windage slide 35 to the right or left, the amount thereof being indicated by the numerals on said knob 33 and the lines 29 and 30 at the ends of said windage slide. There are preferably eight facets on the knob 33, each indicating one half minute of windage adjustment. A complete revolution of said knob 33 will expose one additional line 29 or 30 at the ends of said windage slide, whereby each of such exposed lines indicates 4 minutes of windage adjustment.

It is obvious that various changes and modifications may be made in the structure above shown and described without departing from the spirit and scope of the invention as hereinafter claimed.

What I claim is:

l. A rear sight mechanism for small arms comprising in combination, an elevation member, a windage member mounted to slide transversely on said elevation member, a windage `adjusting screw tapped in said elevation member, the windage member being keyed to said windage screw for partaking of its transverse movement, and a ratchet holding device acting between said windage member and windage screw.

2. A rear sight mechanism for small arms comprising in combination, a vertically movable elevation slide, an adjusting nut for said slide, a vertical spindle for said nut, a windage slide mounted for transverse movement in said elevation slide, a windage adjusting screw tapped in said elevation slide, interengaging portions on said windage screw and said nut spindle for limiting the transverse movement of said screw, the windage slide being keyed to said windage screw to partake of its transverse movement.

3. A rear sight mechanism for small arms comprising in combination a vertically movable elevation slide, an adjusting nut for said slide, a vertical spindle for said nut, a windage slide mounted for transverse movement in said elevation slide, a windage adjusting screw tapped in said elevation slide having a finger operated knob and passing adjacent said spindle, inter-engaging portions on said windage screw and said nut spindle for limiting the transverse movement of said screw, the windage slide being keyed to said windage screw to partake of its transverse movement, and a ratchet holding device comprising a spring pressed detent mounted in said windage slide coacting vitl a notched portion of said windage screw 4. A rear sight mechanism for small arms 5 comprising in combination, an elevation member, a windage member having ends mounted to slide transversely in said elevation member and having an intermediate portion carrying a sighting point, there being graduation lines for windage being marked on the ends of said windage member and adapted to be exposed when said windage member is adjusted transversely in said elevation member, a windage adjusting screw tapped in said elevation member, the windage member being keyed to said windage screw for partaking of its transverse movement, said screw having a linger operated knob and indications of windage being marked on the periphery of said knob, and a ratchet holding device acting between said windage member and windage screw. j

5. A rear sight mechanism for small arms comprising in combination, an elevation member, a windage member mounted to slide transversely `on said elevation member, a windage adjusting screw tapped at one end into a lthreaded bearing in said elevation member and having a rotative bearing at its other end in said elevat-ion member, said 'windage screw being spring tensioned so as to tend to spring out of line between said threaded and rotative bearings to thereby avoid play in said bearings, and the windage member being keyed to said windage screw for partaking of its transverse movement.

6. A rear sight mechanism for small arms comprising in combination, an elevagpnnmmmember, a windage member having ends mounted 40 visi; ii@ transversely i Ajoer 'limvi''gya'inte ediate portion carrying a sighting point, there being graduation lines for windage marked on the ends of said windage member and adapted to be exposed when said windage member is adjusted transversely in said elevation member, a windage adjusting screw for said windage member having a inger operated knob with indications of windage being marked on the periphery of said knob.

In testimony whereof I have affixed my signature.

JOHN D. PEDERSEN. 

